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參數(shù)資料
| 型號： | HV857 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | High Voltage EL Lamp Driver for Low Noise Applications(高電壓,低噪雙路EL燈驅動器) |
| 中文描述： | 高壓發(fā)光燈驅動器的低噪聲的應用（高電壓，低噪雙路發(fā)光燈驅動器） |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 638K |
| 代理商： | HV857 |
7
HV857 Application Note
11/27/01
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
Application Note
AN-H43
HV857 EL Lamp Driver Circuits for Low Audible Noise or
High Brightness Applications
This Application Note describes the method (patent pending) to
reduce the audible noise generated by an EL (Electrolumines-
cent) lamp used in mobile phone applications.
This Application Note also provides example circuits as a guide-
line for applications with different lamp sizes, input voltages, and
brightness requirements.
For additional assistance in designing EL driver circuits, please
refer to Application Notes AN-H33 (effect of external compo-
nents on performance of Supertex EL drivers), Lamp Driver
Circuits.
by Roshanak Aflatouni, Applications Engineer
When constructing and testing one of the driver circuits listed
below, keep in mind that results may differ from those given due
to lamp characteristics and component tolerance.
When making component changes for circuit optimization, al-
ways remove supply voltages first. After making adjustments,
bring up the supply voltage slowly starting from the minimum
required device input voltage while monitoring input current. A
sharp rise in current usually indicates a saturated inductor. Use
a higher current rated inductor, a higher value inductor, or
increase conversion frequency by lowering R
SW-OSC
value.
Figure 1: Typical Application Circuit
EL Lamp
+
C
S
1
2
3
4
8
6
5
HV857MG
7
V
IN
V
DD
R
SW-osc
R
EL-osc
Gnd
L
X
C
S
V
B
V
A
L
X
SB01-15
1.0
μ
F
V
DD
Enable Signal
ON=V
DD
OFF=0
Sanyo Diode SB01-15CP
Series R
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相關代理商/技術參數(shù) |
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|---|---|
| HV857_07 | 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:Low Noise, High Voltage EL Lamp Driver IC |
| HV857DB1 | 功能描述:電源管理IC開發(fā)工具 HV857 Demo Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| HV857K7-G | 功能描述:顯示驅動器和控制器 High Voltage Low Noise EL Lamp RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| HV857L | 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:Low Noise, High Voltage EL Lamp Driver IC |
| HV857LDB1 | 功能描述:電源管理IC開發(fā)工具 HIGH VOLTAGE LOW NOISE EL LAMP DRIVER DEMOBOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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